大型溶洞对隧道开挖稳定性的影响分析  

Influence of a Large Karst Cave on Rock Mass Stability during Tunnelling

作　　者：李元海[1,2] 杨苏[1,2] 喻军[1,3] 干昆蓉[4] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,徐州221116 [2]中国矿业大学力学与建筑工程学院,徐州221116 [3]浙江工业大学建筑工程学院,杭州310014 [4]中铁隧道集团有限公司技术中心,洛阳471009

出　　处：《现代隧道技术》2016年第4期52-60,共9页Modern Tunnelling Technology

基　　金：国家自然科学基金面上项目(51174197);国家重点基础研究发展计划(973)项目(2014CB046905);江苏省高校"青蓝工程"中青年学术带头人培养项目(2012)

摘　　要：针对武广客运专线大瑶山隧道修建过程中遇到岩溶突水导致的围岩稳定性问题,文章采用FLAC^(3D)数值模拟方法,研究了溶洞对于隧道围岩稳定性的影响规律,并对隧道开挖穿越溶洞地层采取的充填与注浆加固方案进行了比较分析。研究结果表明:(1)溶洞与隧道的影响间距范围为0~1倍洞径,边墙一侧溶洞对另一侧边墙变形的影响较小;(2)溶洞与隧道之间的岩层存在拉伸破坏区,受力与变形显著;(3)溶洞回填和注浆加固可改善围岩应力状态,减小围岩变形与塑性区范围,径向注浆加固圈以5 m厚度为较优。In light of the rock mass stability problem induced by a karst water burst during the construction of＇ the Dayaoshan tunnel on the Wulmn-Guangzhou passenger dedicated line, and based on a FLAC3D numerical simulation, this paper studies the influence of the karst cave on the rock mass stability and analyzes the filling and grouting schemes for the karst stratum that the tunnel passes through. The results show that： 1） the influence distance of the karst cave is 0-1 times the tunnel＇s diameter, and the karst cave on one side of the sidewall has slight influence on the deformation of the other side of the sidewall; 2） there is a tensile failure zone in the rock stratum between the karst cave and the tunnel, with obvious stress and large deformation; 3） filling and grouting can improve the stress state of the surrounding rock and reduce the rock＇s deformation and plastic range, and the optimum thickness of the radial grouting circle is 5 m.

关 键 词：岩溶地层 隧道 围岩稳定性 注浆加固 FLAC(3D) 

分 类 号：U457.5[建筑科学—桥梁与隧道工程]